The igmp send-router-alert command configures an interface to send IGMP messages containing the Router-Alert option in IP headers.
The undo igmp send-router-alert command configures an interface to send IGMP messages without the Router-Alert option in IP headers.
By default, the IP headers of IGMP messages sent by an interface contain the Router-Alert option.
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Usage Scenario
The igmp send-router-alert command generally works together with the igmp require-router-alert command.
The function of the igmp send-router-alert command is the same as the function of the send-router-alert command in the IGMP view. The configuration in the IGMP view is effective for all interfaces, whereas the configuration in the interface view is effective only for the specified interface. The configuration in the interface view takes precedence over the configuration in the IGMP view. The configuration in the IGMP view is used only when the configuration in the interface view is not available.